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So I went to napa to get some royal purple to replace my M1 and noticed they had amsoil in stock and about 6 different kinds. I'm currently running 5w-30 and might make a jump up to 10w-30 since the recient "spun bearing" threads have me scared. I'm stage 2 with a 2003 wrx wagon and it has 65k on the clock. Full catless and running a typhoon intake with cobb em. Anyone got a suggestion on what to go with?? How about the euro mix 0W-40 stuff?? Why would I want 0 weight at a cold start, wouldn't that damage something??

Here's a recent uoa on the ASL. The Amsoil Heavy Duty Diesel 5W30 has more anti-wear additives than any Amsoil and will probably be better for bearing protection that the ASL 5W30. Their Euro oil is 5W40 and not 0W40, but I don't hear too much about it.

xw30 oil is a 30 weight at operating temp, regardless of what the first number is. The first number only refers to cold start pumpability. Check the Product Data Sheet at the bottom of each oil page on Amsoil's web site. The viscosity at 100C will all be similar for 30 weight oils. An oil with a higher HTHS is a more shear stable oil.

I don't know if this will help any, but I tried the euro 5w40 Amsoil and had some consumption with it and then tried the ASL 5w30 and haven't seen any consumption at all. I am sending in a sample soon to see how the ASL is doing in my engine.

edit: If you have cats, I wouldn't run the 5W30 HDD. It has higher levels of detergents and anti-wear additives than the diesel 5W40 (DEO). The DEO is for use in applications where API CJ-4 (the latest diesel spec) is required. edit again: Oh, you're catless! FYI, for catted people then.

Please report back in 5,000 miles. During my last OCI on GC, my consumption was 1 quart in 8,000 miles. I added 1/2 quart at 6k and 1/2 at 7k. Then again I'm not ..." stage 2 with a 2003 wrx wagon and it has 65k on the clock. Full catless and running a typhoon intake with cobb em...."

im running 5w30 extended Amsoil.
Run it all the way to 7500 with no filter change, my UOAs still come back fine.

how much is it for a blackstone lab test like that?? Where do I go/send it to get it tested?? 7500 miles is pretty damn far on an oil change kinda scares me to be honest with you, esp with the filter ont being changed.

how much is it for a blackstone lab test like that?? Where do I go/send it to get it tested?? 7500 miles is pretty damn far on an oil change kinda scares me to be honest with you, esp with the filter ont being changed.

7500 miles is pretty damn far on an oil change kinda scares me to be honest with you, esp with the filter ont being changed.

7500 miles may be perfectly fine depending upon usage patterns and engine condition. Don't ever go that far without verifying with UOAs along the way. If the engine is healthy, 7500 miles is a cake-walk for the Amsoil EaO filter. 15,000 miles on one EaO is doable if the engine is healthy and clean (inside). Again, don't try this without verifying.

Diesel oils, in general, have a higher level of anti-wear additives like zinc and phosphorous. That's why so many are switching to Rotella. Amsoil's 5W40 is actually on the thin of being a 40 weight, while the diesel oil has a thicker viscosity when hot. The diesel oil also has a higher High Temp High Shear.

Keep in mind that diesel oils need not be (and thus almost never are) friction-modified like gasoline oils are. That means, even if everything else is the same, the non-diesel oil will be 'slicker' so to speak. One might possibly notice this in how free-revving the engine is, or in slightly better mpg. Again, this is with everything else being the same (viscosity, bases, protection levels, etc.). So, if you can get the viscosity you want in a non-diesel oil, you get other benefits.

Amsoil is tough to outguess in terms of their metallic additive levels based on their recommended applications. Since they don't seek API approval, they don't have to use the newer-technology additives that are replacing organo-metallics. Thus, either, both, or neither of the oils in question may have high levels of the old-tech metallic adds like zinc and phos, or they may instead use the newer, higher-tech adds you can't see in a UOA. You just don't know unless you buy them and analyze them.

Diesel oils, in general, have a higher level of anti-wear additives like zinc and phosphorous. That's why so many are switching to Rotella. Amsoil's 5W40 is actually on the thin of being a 40 weight, while the diesel oil has a thicker viscosity when hot. The diesel oil also has a higher High Temp High Shear.

What we have also been doing is testing in various cars some of the different oils... I hope to have some numbers in a a month or so to post up. We firmly believe in real world evaluations. So we try and do it ourselves. To be honest, we have used ASL 5w 30 then switched to the diesel 5 w 30 when we first got our WRX wagon. After comparing samples (I would have to look for the paperwork, it has been about two years) and the specs of the Euro 5 w 40. We made the decision to use the Euro 5 w40. It was less expensive than the diesel 5 w30 at the time... However, with us turning up the wick on the wagon we will feel better using the Diesel 5 w40.

Keep in mind that diesel oils need not be (and thus almost never are) friction-modified like gasoline oils are. That means, even if everything else is the same, the non-diesel oil will be 'slicker' so to speak. One might possibly notice this in how free-revving the engine is, or in slightly better mpg. Again, this is with everything else being the same (viscosity, bases, protection levels, etc.). So, if you can get the viscosity you want in a non-diesel oil, you get other benefits.

Another speculation that I'll make is that folks that push their cars harder are less concerned with fuel economy. I do wonder what the actual difference is though between mpg's with say Amsoil 10W30, 5W40 Diesel and 5W40 Euro. On a recent trip from NJ to SC, my fuel economy varied by nearly 5 mpg's depending how fast I drove and how much weight I was carrying.

It's a good point that if you don't need a Diesel 5W40 that you will get benefits from other oils. I'm pretty sure that Amsoil would even email your the amount of additives in their oils. They list the amount of phosphorous and zinc in their heavier duty oils here: http://www.amsoil.com/dealer/techser...lat_Tappet.pdf
I would assume that the levels in the diesel 5W40 are less since has similar specs to a CJ-4 oil.

I've used Amsoil ASL 5w30 for the last 80k-90k miles (currently at 130k miles). My car is a daily driver though with the occasional road trip or road rally. It's been good to me so far (i used Castrol GTX for the first 10k, then Castrol Syntec before switching to Amsoil, all 5w30).

Another speculation that I'll make is that folks that push their cars harder are less concerned with fuel economy.

I'm sure you're right, bluesubie.
The point I was trying to make is that all else equal, meaning equal protection, etc. in all respects, it would be silly to pass up the benefits of the extra friction modification. I mean, if you _didn't_ give up any protection whatsoever, why wouldn't you want to buy less fuel for your race car? Or the corollary: Why wouldn't you want 5 more hp from your race car?
That's why the folks pushing their cars so hard should be concerned with it.